231131020120 has 384 divisors, whose sum is σ = 744940022400. Its totient is φ = 62585487360.

The previous prime is 231131020097. The next prime is 231131020139. The reversal of 231131020120 is 21020131132.

231131020120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231131020094 and 231131020103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7472046 + ... + 7502914.

It is an arithmetic number, because the mean of its divisors is an integer number (1939947975).

Almost surely, 2^231131020120 is an apocalyptic number.

231131020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231131020120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372470011200).

231131020120 is an abundant number, since it is smaller than the sum of its proper divisors (513809002280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231131020120 is a wasteful number, since it uses less digits than its factorization.

231131020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30939 (or 30924 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 231131020120 its reverse (21020131132), we get a palindrome (252151151252).

The spelling of 231131020120 in words is "two hundred thirty-one billion, one hundred thirty-one million, twenty thousand, one hundred twenty".